This timeline highlights the major accomplishments of Samsung, demonstrating how the company expanded its product line and global reach, grew its revenue and market share, and maintained a dedication to improving consumers’ lives worldwide. Samsung Electronics, a leading participant in the digital convergence movement, provides a diverse range of products such as LCD TV, LED TV, Mobile Phone, Home Theater System, Blue-ray DVD Player, Monitor, I-ADD (I assume this is a typo), ODD (Optical Disc Drive), Printer, Air Conditioner,Washing Machine , Refrigerator,and more. The company will soon inaugurate its newest Customer Service Center at the recently constructed Du Point Building on Don A.
The Customer Service Center in Bevel SST, Canaan De ROR City, is designed to offer comfort and convenience. Its helpful Customer Service Representatives are prepared to assist customers with mobile phone cleaning and TV repairs. The Service Center serves as a one-stop shop for after-sales service of all Samsung products. Additionally, as an environmentally friendly center, there are recycle bins available for disposing of batteries containing lead and other toxic chemicals.
INTRODUCTION On the Job Training is a collaborative effort involving the student, school, and company. It merges classroom instruction with hands-on training in a chosen career field, offering practical work experience. Moreover, it enables students to witness and apply theoretical knowledge provided by their instructors. This exposure to real-world work tasks facilitates swift adjustment to employment. Presently, numerous companies prioritize candidates with prior job experience.
The trainee completed his On the Job Training at the Samsung Customer Service Center located at Bevel Street, Canaan De ROR City from April 10, 2012 to June 16, 2012. This service center is the sole facility in Misaims Oriental that handles both in and out warranty Samsung Products, including TV, washing machines, air conditioners, refrigerators, computers, cell phones, cameras.
The technicians at the service center are divided into two groups: brown lines and white lines. The brown lines specialize in troubleshooting and repairing TV, computers, components, cell phones etc., excluding refrigerators , air conditioners and washing machines. On the other hand,the white lines are responsible for troubleshooting and repairing refrigerators ,air conditioners ,washing machines,and also handling air conditioner installations.
The service center also provides training opportunities for students. During their fifty-two day On-the-Job Training at Samsung Customer Service Center,the trainee had the opportunity to observe and learn various things including troubleshooting safety measures to prevent possible damages,electric shocks,and exposure to radiation
Ensure that the multi tester is properly configured to the desired testing values. Employ protective measures such as using non-metallic handles and compartment covers. Avoid adding any audio or video accessory or making alterations to the circuit as it could lead to physical damage. Always unplug the TV AC cord before troubleshooting. If any components, materials, or wiring show signs of overheating or damage, promptly replace them with fully functional ones. During circuit testing, thoroughly inspect for any potential causes of a short circuit. The television model can be identified by simply observing its model prefix, such as LAVABO OFF.
Then its screen sizes are classified according to inches. It consists of main board, X board, Y board, power supply, and panel. At CAMPAIGN POLYTECHNIC STATE COLLEGE – Institute of Engineering and Troubleshooting, a common issue with LCD TVs is a lack of power. To diagnose and fix the problem, first check the connectivity of the AC cord. If no issue is found, examine the power supply. Look for visibly damaged components such as leaking capacitors and integrated circuits, and replace them if necessary. Test the unit to see if it powers on. If a power supply of the same model is available, temporarily replace it to confirm that the issue lies in the supply.
If the unit powers on, it indicates that the problem lies with the power supply. If the unit is still under warranty, you will usually need to replace the entire power supply board. However, if the warranty has expired, you can use a multi tester to check other components such as diodes, capacitors, inductors, and more. To test a properly functioning diode, it should only allow current to flow in one direction according to its polarity and maintain a steady voltage of 0.7 volts. A functioning capacitor should temporarily deflect and then quickly return to zero reading. A working inductor will deflect and show connectivity. When examining an integrated circuit, be sure to confirm its voltage input and output values.
Similar to a diode, the functional transistor has the ability to redirect in one specific direction on its base to emitter. In certain cases, the power problem in a TV may not be coming from the power supply or main board but instead from the touch button or power on/off button switch. As a result, troubleshooting switch buttons was also assigned to the trainee. If there is an issue with tuning and the LCD TV fails to detect channels, it is likely that the defective component is the tuner, which can be found on the main board. Typically, if the tuner is faulty, it must be directly replaced or alternatively, if a replacement tuner is not available, it may be necessary to replace the entire main board.
If the main board is faulty, it will usually cause the TV screen to appear dim and may also result in the screen turning off after a short time. Additionally, a defective main board can be identified by the absence of video or audio on the screen. To thoroughly troubleshoot this issue, both the trainee and technician carefully inspect and examine the components of the main board. However, if resolving the problem becomes challenging due to complex circuitry and small parts, replacing the entire main board directly becomes necessary, similar to troubleshooting computer parts. If there is a slight defect on the screen, it is likely caused by an issue with the Y board.
If the line is vertical, the defective component is the X board. The board can be troubleshooted by either replacing parts or directly replacing the entire board because it contains small components. In the case of no audio or issues with volume, sometimes the problem is not with the main board, but rather with the push button switch or the remote. The troubleshooter must keep this possibility in mind. If the issue lies with the panel or the display screen, it is important to consider that the panel consists of the TCO (thermal cut-off) or the circuit board that connects the display screen to the main board, as well as the screen itself. The TCO acts as the control circuitry for the input signal from the main board.
The panel may show symptoms of being defective, such as displaying but not rastering and having a cracked surface. The panel consists of multiple layers of glass and other components. If the panel is cracked, it cannot be repaired and must be substituted with an identical model. However, if there are no defects in the glass layers or back lights on the screen, the troubleshooter can ascertain that the TCO is causing the defect. When replacing a panel, the TCO is automatically included since it is an integral part of the panel. If a TCO of the same model is available, it can be directly replaced without including the screen.
When there is a defect in the panel, it does not necessarily mean that the entire panel is defective. The back light of an LCD TV consists of multiple thin fluorescent lights in a U shape. If one of these lights is faulty, the area of the screen corresponding to the defective back light will appear dim when the TV is powered on. However, in most cases, the entire panel is replaced instead of just the faulty part. In comparison, Plasma TVs are thicker in appearance compared to the other two types of flat TVs, and they are typically identified as AS TV. On the other hand, LED TVs are thin and have a model Prefix of CIA, for example SIMULACRUM.
In troubleshooting Plasma Display TVs and LED TVs, the process is similar to that of LCD TVs. The signs of trouble are also the same. However, plasma TVs are more susceptible to panel cracks due to shock. The only differences between them lie in their appearance, circuit design, and casing fabrication. In Computer Studies Parts Replacement of Flat TVs, the trainee’s task was to directly replace any defective parts of flat TVs, be it LCD, LED, or plasma. Generally, if the main board, panel, or X and Y boards have faulty components, customer service will replace the entire board.
It is crucial to use different screws for metal and plastic when loosening them. Metal screws have fine threads, while plastic screws have broader threads. When replacing panels and boards, both trainees and technicians must be careful to avoid causing any damages. A Cathode Ray Tube (CRT) Television comprises various main components such as the main board, CRT board, yoke, and picture tube. The audio, video, signal, and power supply circuits are housed in the main board. Among these circuits, the power supply circuit is regarded as the primary component while the others are considered secondary.
To troubleshoot a CRT TV, the initial step is to identify the symptoms of the issue, including no power, line on screen, no display with power, no audio, no aster, and others. It is advisable to first solder any dry solder and test the unit for resolution before proceeding with troubleshooting the components. If the problem persists, a more thorough troubleshooting process is necessary.
When faced with a TV that has neither picture display nor sound, there are specific steps to take. Firstly, check the AC voltage impress and ensure that the master switch is turned on. Additionally, inspect the fuse and replace it if faulty. Once these measures have been completed and the TV functions properly once again, consider the repair process complete.
If the fuse is okay (K), check the diode in the power supply near the high voltage capacitor. If it is defective, replace it. If the diodes are okay (k), check ICC or the regulator ICC. If it is not okay (K), replace it. If none of them are defective, check the other parts, starting from the transformer. There might be a different voltage output, such as the B+ or 1.25 V line. Check the connectivity, and the voltage should be the same. Diodes should only be defective in one direction according to their polarity. This method is known as voltage tracing. The trainee should also visually inspect for obvious defects like exploded capacitors, resistors, and ICC.
If there is a horizontal line on the screen, check the vertical ICC. If there is a vertical line on the screen, check the horizontal. Then, temporarily replace it with the good ICC to check the CAMPAIGN POLYTECHNIC STATE COLLEGE – Institute of Engineering and Computer Studies unit. If it is okay, then the repair is completed. However, if unusual lines appear on the screen when watching or recording, try to keep the video player as far away from the Television as possible because it can cause signal interference. If the TV has no sound but has video, the trouble is either in the audio circuit or in the speakers.
Please check the TV and replace any defective parts. If the TV has audio but no display, check the voltage between the main board and the CRT board. If the voltage is not k, there is a problem with the video circuit on the main board. If the output from the main board to the CRT board is k, inspect the wire connection and components on the CRT board. If the CRT board is faulty, it should be replaced. If the CRT board is k, move on to checking the yoke. The yoke is a coil, so verify wire connectivity and ensure it is not shorted. If the yoke is k, then the picture tube is defective and needs to be replaced. Once these steps are completed and the TV is k, the repair is finished.
If there is no channel, first check the tuner and antenna. If the antenna is faulty, replace it with a good one to test the tuner. If the fifth TV is still not working after replacing the tuner, then the repair is complete. For complex issues, try floating one or two terminals of components like resistors, diodes, and transistors when checking them because deflection may not be accurate near inductive components. The technician advised the trainee to remember: always unplug the TV and discharge high voltage capacitors in the primary part of the main board when troubleshooting.
When replacing capacitors, it is crucial to verify correct polarity during installation. When using a tester, connect the grounding lead to the positive lead and remove the ground lead last. Also, be cautious of any current leakage that may come into contact with the high capacity capacitor. When removing a CICS with a heat sink, pay attention to include the heat sink in the process to avoid transistor damage. After completing the repair, double-check that screws, parts, and cables are properly installed. Additionally, ensure no damage has occurred to the repaired part or its surroundings.
The Computer Studies DVD Player DVD is composed of three main components: the main board, power supply board, and the DVD deck. The initial step involves inspecting for any indications of malfunction. If the problem lies in the DVD not loading correctly, attempt to access the device and cleanse the reader lens. If this resolves the issue, then the repair is considered complete. However, if the problem persists, temporarily substitute the main board with a functioning one of identical model. If even after replacing the main board, the problem remains unresolved, it indicates a defect in the DVD deck. In such cases, it is recommended to replace the Reader Lens assembly.
If there is a persistent issue, first check the motor and replace it if necessary. If the main board is malfunctioning, it is recommended to replace the entire main board due to its intricate circuitry. In case the DVD player lacks power, inspect the fuse and if it is faulty, move on to examining the diode and capacitor. Replace any defective components and if the player still lacks power, then the repair is complete.
When troubleshooting sound boxes, keep in mind that they have a simple circuitry consisting of wires and speakers. Therefore, verify wire connectivity and speaker conductivity.
Lastly, an audio component refrigerator is an apparatus, cabinet, or room used to store food or other substances at a low temperature.
The Refrigerator Troubleshooting in Computer Studies involves the following steps: if the refrigerator does not defrost but has normal refrigeration with the compressor running, the defrost timer shaft should be turned until a click is heard. Then, check the operation of the timer motor by observing the rotor through the window on the back of the timer. If the motor rotates, it means that the defrost timer needs to be replaced. On the other hand, if the motor does not rotate, check for voltage on timer terminal no. 3. If there is no voltage, inspect the circuit wiring. If there is voltage, then it is confirmed that the defrost timer is defective. Another issue to address is if the refrigerator does not defrost while the compressor is running; in this case, also turn the defrost timer shaft until a click is heard.
When the compressor is continuously running, it indicates a defective defrost timer. If the refrigerator does not defrost even with the compressor running, turn the defrost timer shaft until one click is heard. This will cause the compressor to stop, but if defrost still does not occur, unplug the service cord from the power outlet. To determine if the defrost timer is faulty, use an Ohm meter to check for continuity between terminals 3 and 2 of the timer. If the meter does not register a reading, replace the defrost timer. If the meter does register a reading, proceed to check for continuity across the defrost termination thermostat below -5 degrees. If the meter still registers a reading, check for continuity across the defrost heater.
If the meter does not register, it indicates a defective defrost heater. However, if the meter does register, the wirings should be checked. If the temperature is below -5 degrees Celsius, it will not register and the defrost termination/thermostat should be replaced directly. In another scenario where the compressor is not running, open the food compartment door and check if the interior light is on. If the light is on, turn the defrost timer until two consecutive clicks are heard (not in defrost mode). If the compressor still does not run, bridge the thermostat line terminals. If the compressor runs after bridging, it means the thermostat is defective.
However, if the compressor does not run, check for the voltage at the relay package (using the black and white leads). If there is voltage (denoted as K), connect an external test cord to the compressor and check if the compressor is defective. However, if there is no voltage at the relay package, check the operation of the defrost timer. If it is K, check the circuit wiring. If it is not K, then the defrost timer is defective. When troubleshooting, use hot water and an electric fan to defrost thick ice. If the fan is not running, make sure the compressor is running and check for any mechanical issues with the fan. If the fan is seized, replace the fan motor.
Notice of Using: Do not operate the refrigerator in the presence of explosive gas to avoid fire or an explosion by ignition of the electric contact of the refrigerator.
To save money, do not overload your set with a lot of foods; leave proper spaces.
Cover moist foods with tight lids, plastic containers or wrapped in Vinyl film.
Air Conditioning: The sizes of air conditioner depend on the sizes of the room to be air condition. It is measured in horsepower/ton/K/H. Examples of models are ASPI PALS, ASPI 3, and SAVIOR.
There are various types of air conditioner according to use, such as window, split, floor and ceiling.
Regular Air Conditioner: This is the older model of air conditioner that is directly supplied by an AC supply voltage. There are no electronic components involved in the circuitry. The disadvantage of this model is that it consumes high electrical consumption.
Smart Inverter Air Conditioner: This type of air conditioner has an electronic part that supplies the motor and other components through the inverter. The inverter converts the AC (alternating current) to DC (direct current) and then back to AC. The advantage of this type is that it saves 40 percent (40%) of electrical consumption compared to the regular air conditioner.
The installation of a split type air conditioner is crucial for customer satisfaction and to extend the lifespan of the unit. The installation process involves two major parts: the indoor/evaporator unit and the outdoor/condenser unit. To properly install the unit, trials are required, such as using copper tubes as piping connections between the indoor and outdoor units. Two sizes of copper tube are needed for this purpose. The primary tube, which is typically larger, has a diameter of either 1/2, 5/8, or 3/4 inches, depending on the size of the air conditioner. The secondary tube, on the other hand, is smaller and measures 1/4 inches in diameter.
The smart inverter type air conditioner has a communication wire between the indoor and outdoor units. This wire supplies power to the compressor and allows for electronic communication. The specific wires used are 1_1, L 2, Fl, IF, and E (ground). To protect against moisture and disturbances, the wire and copper tube are insulated with rubber. This insulation is then covered with Teflon. During installation of the indoor unit, it is important to leave at least 8 inches of space between the air inlet of the evaporator and the ceiling. This allows for proper air absorption during evaporation. The indoor unit has a metal plate at its back, which is used to hang and secure the unit.
Then, the indoor unit must have a drainage connection with a flexible hose that needs to be positioned lower than the indoor unit. This allows for a continuous water flow, which is produced by the moisture of the evaporator. Adjacent to the metal plate, there is a hole for the piping. The outdoor unit can be placed at the back or anywhere within a distance of thirty meters from the indoor unit. Fitting valves are used to connect the piping, and a flier tool is required for this connection. The flier tool is used to expand the pipe so that it can fit into the valve. For long piping, the copper tube will need to be soldered.
In soldering, start by fliering the pipe and then connect it before soldering it with a copper rod using a map gas or blue torch. Ensure proper soldering to prevent leakage of Freon gas. The air inlet of the condenser in the outdoor unit should have a minimum allowance of twelve inches from the wall. Make sure the area is secure and free from any disturbance to ensure the safety of the unit. The compressor contains free Freon. Loosen the gas valve in the outdoor unit. Start with the small copper tube, then check the gas pressure at the charging valve by pressing it at least three times to check the tube. Finally, loosen the large copper tube.
It is important for the piping to be free of leaks in order to retain the gas refrigerant within the tubes and maintain the cooling capability of the unit. To assess for leaks, a gauge can be used by connecting it to the expansion valve. The gauge should provide a reading that is not constant; if the reading is not constant, it indicates that the refrigerant is leaking from the tubes. To pinpoint the location of the leak, a soap bubble can be applied to the connected valve and copper tube. If the bubble multiplies, it signifies the presence of a leak, and it should be tightened again. Once all leaks have been resolved, the installation is considered complete.
Cleaning maintenance is crucial for the unit, and it involves using a water compressor to generate high pressure water for the cleaning process. When the unit is dirty, its cooling capability is reduced. It is recommended to clean the filter of the unit every five days and the entire unit at least once every three months. An unclean unit can result in ice formation on the outside of the evaporator. The trainee was given the task of assisting and cleaning both split and window type air conditioners. When cleaning a window type unit, it should be operated for at least ten minutes before being removed from the casing.
After testing the unit, remove the cover and filter. Take out the circuitry assembly and disconnect the terminals that are connected to the capacitor to avoid any risk of short circuits. Be cautious because the capacitor carries a high voltage. Clean the unit and allow it to dry for a few minutes before reassembling it. Finally, secure the cover and test the unit again. When cleaning a Split type air conditioner, begin by cleaning the evaporator followed by the outdoor unit. While cleaning the evaporator, ensure that the circuit board does not come into contact with water. Either remove the board or cover it.
Ensure that all dirt inside the unit is removed. If the evaporator fan is not running, troubleshoot the air conditioning system by checking for power at the evaporator fan relay. If it receives power but the contacts do not close, the relay has failed. If it receives power and the contacts close but the fan still doesn’t run, check for voltage on the load side of the relay, examine the leads to the fan, test the fan windings and capacitor, and inspect for any obstructions causing the blower to be stuck. If the unit becomes noisy, it is due to a defective motor.
If a unit is flooded or if houses near the seashore, the bearing of the fan motor will corrode. To solve this issue, it is necessary to replace the bearing. One reason for a unit to have low cooling is if it is unclean. It is important to have maintenance cleaning of the unit at least once every three months. If the unit is unclean, the outside of the copper tubes in the condenser will ice. To clean the unit, use a water compressor if the unit turns off. This will solve the trouble. If the trouble persists, check the condenser copper tube, evaporator copper tube, and connection copper tube (for split type air conditioners) for any leaks of refrigerant gas.
When there is a refrigerant leak, you will notice that the copper tubes are dry and the unit operates as if it were just a regular fan. To find the leak, use soap bubbles; the area with the leak will produce bubbles. Solder the leak and add more Freon Gas to the expansion valve on the copper tube. If there is no power, check the AC cord and wiring conductivity in the unit. Test the switch assembly by using a multimeter or by shorting the wires connecting the switch. If the unit starts working, replace the switch and consider the repair complete.
When the compressor does not run, it is important to check the starting capacitor as it is typically the first component to be examined. If the capacitor is found to be faulty, it should be replaced. If the capacitor is functioning properly, the overload protector in the compressor should be inspected. If it is determined that the overload protector is shorted, it should also be replaced. Additionally, polishing the clips that connect the compressor terminals could resolve the issue. However, if the problem persists, the compressor itself may need to be replaced.
The washing machine consists of several major parts including the main board, tab motor shafting, spin motor, water level sensor, and water entry and drain sensor.
CAMPAIGN POLYTECHNIC STATE COLLEGE – Institute of Engineering and Computer Studies Low Spin: You should first check if the motor shaft is correctly connected. If the shaft is okay, then inspect the wire connection for any defects. If there are no defects, replace the spin motor. If the unit is functioning well, the repair is completed. If the unit is unable to sense water levels, immediately replace the water sensor. If the problem persists, consider replacing the main board or troubleshoot individual components. However, it is usually best to directly replace the main board due to its durable waterproof insulation. If the unit is working fine, the repair is completed.
If the unit has water entry even if start is not yet pressed or if there is no water entry when start is pressed, replace the water entry assembly. If the unit cannot drain, then replace the drain assembly. If the unit is K, repair is completed.
Laptop Computer and Flat Monitor:
The trainee was assigned to troubleshoot a monitor that had no power. With the help of the technician, the trainee identified that the issue was with the switch button. The switch assembly was replaced.
The trainee was also assigned to replace parts of the monitor such as the main board and display screen.
